Liz Buchanan BVSc
Hello! I noticed the phrase 'drinks plenty of water.' This may be something or nothing, but drinking too much can be even more of a sign of a problem than drinking too little, so it is worth being aware of this.
If a dog has been refusing food, out of character, consistently for nearly two weeks, I would be concerned. How recent were those recent blood tests? It sounds as though he needs to see the vet, possibly as a matter of urgency (give your vets a call for triage). Your vet may be grateful for a urine sample caught in a cleaned, dried container on the way. If blood tests are needed again, you are in a good position as you have recent 'normals' to compare them to.